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Edexcel | Chemistry WCH0 | W 19 5 1 | 1 hour 45 minutes
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18
(a)
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1 Mark

Cinnamaldehydeis a liquid that is slightly soluble in water but is

much more soluble in ether.  It decomposes below its boiling temperature.

It can be extracted from cinnamon.  Sticks of cinnamon are ground up and

mixed with water.

 Select the correct order of practical techniques to obtain cinnamaldehyde from

this mixture. 

  A steam distilling, extracting with ether, distilling off the ether

  B refluxing, extracting with ether, distilling off the ether

  C filtering, refluxing, extracting with ether

  D steam distilling, filtering, extracting with ether

The only correct answer is A

B is not correct because steam distilling is needed.

C is not correct because steam distilling is needed.

D is not correct because the ether must be distilled off.

18
(b)
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Which test result for cinnamaldehyde is not correct?

The only correct answer is A

B is not correct because the C=C will decolourise acidified

potassium manganate(VII).

C is not correct because phosphorus(V) chloride does not react

with C=C or the aldehyde group.

D is not correct because the CHO will form silver with Tollens’

solution.

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